Yaesu FT-712RH Operating Manual page 7

(3) Auto Dimmer Sensor
Behind the glass is a photosensor which detects the level of ambient light,
causing the display lamps to be automatically dimmed in the dark.
(4) VOL Control
This control adjust the volume of the receiver audio.
(5) SQL Control
This control sets the threshold level at which received signals (or noise) open the
squelch. For maximum squelch sensitivity set this control from counterclockwise
just to the point where noise is silenced (and the BUSY indicator on the display
is off) when the channel is clear.
(6) MIC Jack
This 8-pin jack accepts microphone input and scanning control from the
microphone and/or control signals from an external computer. Memory cloning
can be performed with another transceiver through this jack, and an internal
modification also allows packet radio tnc connection here. Pinout is shown on
the next page.
(7) POWER Switch
This two-position push button turns the transceiver on and off.
(8) LOW/LOCK Button
Normally, this button toggles between high and low transmitter power output.
When low power is selected, two low-pitched beeps sound, and "LOW" appears
at the lower right corner of the display. Two highpitched beeps sound when high
power is selected.
If the F/WRITE button is pressed just before pressing the LOW/LOCK button,
transmitter power is not changed, but rather low/high beeps sound, and "LOCK"
appears in reverse letters at the lower left corner of the display, indicating that
the selector knob and all other
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